5% of the shares in the ROC are held by Rundfunk Berlin-Brandenburg. rbb benefits from the ROC’s share in the programmes of the two orchestras and two choirs. The ROC’s four ensembles work together closely with the rbbKultur radio station, recording and broadcasting many of their concerts. Projects are also often realised with rbb television. In addition, there is a strong physical link between rbb and ROC: the ensembles’ rehearsal rooms are in the rbb’s complex of buildings in Berlin-Charlottenburg.